MouseListener - Changing background color

Thread view:

Rick - 28 Nov 2006 07:50 GMT

Here is the code I have. Basically all I want to do is change the
background of the frame to black when I click the mouse (mouseClicked)
and change it back to white when I release the mouse (mouseReleased).
I can't access frame directly to do frame.setBackground(Color.BLACK),
and that is where I am stuck.

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class BackgroundChange extends JFrame
{
    public BackgroundChange()
    {

    }

    public static void main(String[] args)
    {
        BackgroundChange frame = new BackgroundChange();
        frame.setTitle("Background Change");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300,300);
        frame.setVisible(true);
        frame.setBackground(Color.WHITE);
    }
}

class BackgroundChangePanel extends BackgroundChange implements
MouseListener
{
    public BackgroundChangePanel()
    {
        addMouseListener(this);
    }

    public void mouseClicked(MouseEvent e)
    {

    }

    public void mouseEntered(MouseEvent e)
    {

    }

    public void mouseExited(MouseEvent e)
    {

    }

    public void mouseReleased(MouseEvent e)
    {

    }

    public void mousePressed(MouseEvent e)
    {

    }
}

Reply to this Message

Michael Rauscher - 28 Nov 2006 08:10 GMT

Rick schrieb:

> Here is the code I have. Basically all I want to do is change the
> background of the frame to black when I click the mouse (mouseClicked)
> and change it back to white when I release the mouse (mouseReleased).
> I can't access frame directly to do frame.setBackground(Color.BLACK),
> and that is where I am stuck.

That's not the way it works. A frame is - hmm... a frame. What you see
on screen within a frame is not the frame but a container. Imagine the
frame as the window border.

A possible solution:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test {
private JPanel getContentPanel() {
JPanel panel = new JPanel();
panel.addMouseListener( new MouseAdapter() {
public void mouseClicked( MouseEvent e ) {
((JComponent)e.getSource()).setBackground(Color.BLACK);
}
});
panel.setPreferredSize( new Dimension(600,400) );
return panel;
}

public void createAndShowGUI() {
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
frame.setContentPane( getContentPanel() );
frame.pack();
frame.setVisible( true );
}

public static final void main( String args[] ) {
SwingUtilities.invokeLater( new Runnable() {
public void run() {
new Test().createAndShowGUI();
}
});
}
}

Bye
Michael

Reply to this Message

MouseListener - Changing background color

Free Magazines